Adding skeleton for unit testing Hexagon Code Emission

Adding and modifying CMakeLists.txt files to run unit tests under
unittests/Target/* if the directory exists.  Adding basic unit test to check
that code emitter object can be retrieved.

Differential Revision: http://reviews.llvm.org/D5523
Change by: Colin LeMahieu

llvm-svn: 218986

lib/Target/Hexagon/CMakeLists.txt

@@ -2,6 +2,7 @@ set(LLVM_TARGET_DEFINITIONS Hexagon.td)
 
 tablegen(LLVM HexagonGenRegisterInfo.inc -gen-register-info)
 tablegen(LLVM HexagonGenInstrInfo.inc -gen-instr-info)
+tablegen(LLVM HexagonGenMCCodeEmitter.inc -gen-emitter)
 tablegen(LLVM HexagonGenAsmWriter.inc -gen-asm-writer)
 tablegen(LLVM HexagonGenDAGISel.inc -gen-dag-isel)
 tablegen(LLVM HexagonGenCallingConv.inc -gen-callingconv)

lib/Target/Hexagon/MCTargetDesc/CMakeLists.txt

@@ -1,5 +1,8 @@
 add_llvm_library(LLVMHexagonDesc
   HexagonMCAsmInfo.cpp
+  HexagonMCCodeEmitter.cpp
   HexagonMCInst.cpp
   HexagonMCTargetDesc.cpp
   )
+
+add_dependencies(LLVMHexagonDesc HexagonCommonTableGen)

lib/Target/Hexagon/MCTargetDesc/HexagonMCCodeEmitter.cpp

@@ -0,0 +1,88 @@
+//===-- HexagonMCCodeEmitter.cpp - Hexagon Target Descriptions ------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Hexagon.h"
+#include "MCTargetDesc/HexagonBaseInfo.h"
+#include "MCTargetDesc/HexagonMCCodeEmitter.h"
+#include "MCTargetDesc/HexagonMCTargetDesc.h"
+#include "MCTargetDesc/HexagonMCInst.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCContext.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/Support/raw_ostream.h"
+
+#define DEBUG_TYPE "mccodeemitter"
+
+using namespace llvm;
+using namespace Hexagon;
+
+STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
+
+namespace {
+/// \brief 10.6 Instruction Packets
+/// \brief Possible values for instruction packet parse field.
+enum class ParseField { duplex = 0x0, last0 = 0x1, last1 = 0x2, end = 0x3 };
+/// \brief Returns the packet bits based on instruction position.
+uint32_t getPacketBits(HexagonMCInst const &HMI) {
+  unsigned const ParseFieldOffset = 14;
+  ParseField Field = HMI.isPacketEnd() ? ParseField::end : ParseField::last0;
+  return static_cast <uint32_t> (Field) << ParseFieldOffset;
+}
+void emitLittleEndian(uint64_t Binary, raw_ostream &OS) {
+  OS << static_cast<uint8_t>((Binary >> 0x00) & 0xff);
+  OS << static_cast<uint8_t>((Binary >> 0x08) & 0xff);
+  OS << static_cast<uint8_t>((Binary >> 0x10) & 0xff);
+  OS << static_cast<uint8_t>((Binary >> 0x18) & 0xff);
+}
+}
+
+HexagonMCCodeEmitter::HexagonMCCodeEmitter(MCInstrInfo const &aMII,
+                                           MCSubtargetInfo const &aMST,
+                                           MCContext &aMCT)
+    : MST(aMST), MCT(aMCT) {}
+
+void HexagonMCCodeEmitter::EncodeInstruction(MCInst const &MI, raw_ostream &OS,
+                                             SmallVectorImpl<MCFixup> &Fixups,
+                                             MCSubtargetInfo const &STI) const {
+  HexagonMCInst const &HMB = static_cast<HexagonMCInst const &>(MI);
+  uint64_t Binary = getBinaryCodeForInstr(HMB, Fixups, STI) | getPacketBits(HMB);
+  assert(HMB.getDesc().getSize() == 4 && "All instructions should be 32bit");
+  emitLittleEndian(Binary, OS);
+  ++MCNumEmitted;
+}
+
+unsigned
+HexagonMCCodeEmitter::getMachineOpValue(MCInst const &MI, MCOperand const &MO,
+                                        SmallVectorImpl<MCFixup> &Fixups,
+                                        MCSubtargetInfo const &STI) const {
+  if (MO.isReg())
+    return MCT.getRegisterInfo()->getEncodingValue(MO.getReg());
+  if (MO.isImm())
+    return static_cast<unsigned>(MO.getImm());
+  llvm_unreachable("Only Immediates and Registers implemented right now");
+}
+
+MCSubtargetInfo const &HexagonMCCodeEmitter::getSubtargetInfo() const {
+  return MST;
+}
+
+MCCodeEmitter *llvm::createHexagonMCCodeEmitter(MCInstrInfo const &MII,
+                                                MCRegisterInfo const &MRI,
+                                                MCSubtargetInfo const &MST,
+                                                MCContext &MCT) {
+  return new HexagonMCCodeEmitter(MII, MST, MCT);
+}
+
+#include "HexagonGenMCCodeEmitter.inc"

lib/Target/Hexagon/MCTargetDesc/HexagonMCCodeEmitter.h

@@ -0,0 +1,60 @@
+//===-- HexagonMCCodeEmitter.h - Hexagon Target Descriptions ----*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+///
+/// \file
+/// \brief Definition for classes that emit Hexagon machine code from MCInsts
+///
+//===----------------------------------------------------------------------===//
+
+#ifndef HEXAGONMCCODEEMITTER_H
+#define HEXAGONMCCODEEMITTER_H
+
+#include "llvm/MC/MCCodeEmitter.h"
+#include "llvm/MC/MCExpr.h"
+#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstrInfo.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSubtargetInfo.h"
+#include "llvm/Support/raw_ostream.h"
+
+namespace llvm {
+
+class HexagonMCCodeEmitter : public MCCodeEmitter {
+  MCSubtargetInfo const &MST;
+  MCContext &MCT;
+
+public:
+  HexagonMCCodeEmitter(MCInstrInfo const &aMII, MCSubtargetInfo const &aMST,
+                       MCContext &aMCT);
+
+  MCSubtargetInfo const &getSubtargetInfo() const;
+
+  void EncodeInstruction(MCInst const &MI, raw_ostream &OS,
+                         SmallVectorImpl<MCFixup> &Fixups,
+                         MCSubtargetInfo const &STI) const override;
+
+  // getBinaryCodeForInstr - TableGen'erated function for getting the
+  // binary encoding for an instruction.
+  uint64_t getBinaryCodeForInstr(MCInst const &MI,
+                                 SmallVectorImpl<MCFixup> &Fixups,
+                                 MCSubtargetInfo const &STI) const;
+
+  /// \brief Return binary encoding of operand.
+  unsigned getMachineOpValue(MCInst const &MI, MCOperand const &MO,
+                             SmallVectorImpl<MCFixup> &Fixups,
+                             MCSubtargetInfo const &STI) const;
+
+private:
+  HexagonMCCodeEmitter(HexagonMCCodeEmitter const &) = delete;
+  void operator=(HexagonMCCodeEmitter const &) = delete;
+}; // class HexagonMCCodeEmitter
+
+} // namespace llvm
+
+#endif /* HEXAGONMCCODEEMITTER_H */

lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.cpp

@@ -46,9 +46,8 @@ static MCRegisterInfo *createHexagonMCRegisterInfo(StringRef TT) {
   return X;
 }
 
-static MCSubtargetInfo *createHexagonMCSubtargetInfo(StringRef TT,
-                                                     StringRef CPU,
-                                                     StringRef FS) {
+static MCSubtargetInfo *
+createHexagonMCSubtargetInfo(StringRef TT, StringRef CPU, StringRef FS) {
   MCSubtargetInfo *X = new MCSubtargetInfo();
   InitHexagonMCSubtargetInfo(X, TT, CPU, FS);
   return X;
@@ -59,16 +58,16 @@ static MCAsmInfo *createHexagonMCAsmInfo(const MCRegisterInfo &MRI,
   MCAsmInfo *MAI = new HexagonMCAsmInfo(TT);
 
   // VirtualFP = (R30 + #0).
-  MCCFIInstruction Inst = MCCFIInstruction::createDefCfa(
-      nullptr, Hexagon::R30, 0);
+  MCCFIInstruction Inst =
+      MCCFIInstruction::createDefCfa(nullptr, Hexagon::R30, 0);
   MAI->addInitialFrameState(Inst);
 
   return MAI;
 }
 
 static MCCodeGenInfo *createHexagonMCCodeGenInfo(StringRef TT, Reloc::Model RM,
-                                             CodeModel::Model CM,
-                                             CodeGenOpt::Level OL) {
+                                                 CodeModel::Model CM,
+                                                 CodeGenOpt::Level OL) {
   MCCodeGenInfo *X = new MCCodeGenInfo();
   // For the time being, use static relocations, since there's really no
   // support for PIC yet.
@@ -86,7 +85,8 @@ extern "C" void LLVMInitializeHexagonTargetMC() {
                                         createHexagonMCCodeGenInfo);
 
   // Register the MC instruction info.
-  TargetRegistry::RegisterMCInstrInfo(TheHexagonTarget, createHexagonMCInstrInfo);
+  TargetRegistry::RegisterMCInstrInfo(TheHexagonTarget,
+                                      createHexagonMCInstrInfo);
 
   // Register the MC register info.
   TargetRegistry::RegisterMCRegInfo(TheHexagonTarget,
@@ -95,4 +95,8 @@ extern "C" void LLVMInitializeHexagonTargetMC() {
   // Register the MC subtarget info.
   TargetRegistry::RegisterMCSubtargetInfo(TheHexagonTarget,
                                           createHexagonMCSubtargetInfo);
+
+  // Register the MC Code Emitter
+  TargetRegistry::RegisterMCCodeEmitter(TheHexagonTarget,
+                                        createHexagonMCCodeEmitter);
 }

lib/Target/Hexagon/MCTargetDesc/HexagonMCTargetDesc.h

@@ -15,11 +15,20 @@
 #define LLVM_LIB_TARGET_HEXAGON_MCTARGETDESC_HEXAGONMCTARGETDESC_H
 
 namespace llvm {
+class MCCodeEmitter;
+class MCContext;
+class MCInstrInfo;
+class MCRegisterInfo;
 class MCSubtargetInfo;
 class Target;
 
 extern Target TheHexagonTarget;
 
+MCCodeEmitter *createHexagonMCCodeEmitter(const MCInstrInfo &MCII,
+                                          const MCRegisterInfo &MRI,
+                                          const MCSubtargetInfo &MST,
+                                          MCContext &MCT);
+
 } // End llvm namespace
 
 // Define symbolic names for Hexagon registers.  This defines a mapping from

unittests/MC/CMakeLists.txt

@@ -7,3 +7,9 @@ add_llvm_unittest(MCTests
   StringTableBuilderTest.cpp
   YAMLTest.cpp
   )
+  
+foreach(t ${LLVM_TARGETS_TO_BUILD})
+  if (IS_DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/${t}")
+    add_subdirectory(${t})
+  endif (IS_DIRECTORY "${CMAKE_CURRENT_LIST_DIR}/${t}")
+endforeach()